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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Stock-Based Compensation Plans |
Schedule of components of stock compensation expense |
|  | 2018 |  | 2017 |  | 2016
|  | (in thousands)
2007 Stock Incentive Plan |  | $ | 5,353 |  | $ | 4,207 |  | $ | 3,681
Employee Stock Purchase Plan |  |  | 57 |  |  | 63 |  |  | 36
Total Stock Compensation Expense |  | $ | 5,410 |  | $ | 4,270 |  | $ | 3,717
Summary of restricted stock activity |
|  |  |  | Weighted Average |  | Aggregate Grant |
|  | Number Outstanding |  | Grant Date Fair Value |  | Date Fair Value |
Balance as of December 31, 2015 |  | 396,595 |  | $ | 17.98 |  | $ | 7,131,200 |
Shares granted |  | 136,645 |  |  | 21.55 |  |  | 2,944,941 |
Shares forfeited |  | (20,377) |  |  | 17.79 |  |  | (362,536) |
Shares vested |  | (213,528) |  |  | 17.12 |  |  | (3,655,269) |
Balance as of December 31, 2016 |  | 299,335 |  |  | 20.24 |  |  | 6,058,336 |
Shares granted |  | 215,603 |  |  | 24.89 |  |  | 5,365,731 |
Shares forfeited |  | (10,999) |  |  | 24.38 |  |  | (268,200) |
Shares vested |  | (175,817) |  |  | 19.61 |  |  | (3,448,628) |
Balance as of December 31, 2017 |  | 328,122 |  |  | 23.49 |  |  | 7,707,239 |
Shares granted |  | 270,454 |  |  | 33.91 |  |  | 9,172,223 |
Shares forfeited |  | (9,900) |  |  | 32.06 |  |  | (317,430) |
Shares vested |  | (170,786) |  |  | 22.25 |  |  | (3,799,213) |
Balance as of December 31, 2018 |  | 417,890 |  | $ | 30.54 |  | $ | 12,762,819 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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